In order to assure that dry ice blasting goes smoothly and fully meets expectations, your compressed air should be able to meet the following requirements.
- Pressure: The line pressure should be at least 80 psig; 90 psig or more is desirable.
- Flow: The flow required is 100 to 200 scfm at 80 psig minimum. A line size of 3/4" or more is needed. The minimum dedicated compressor size, given sufficient pressure as referenced above, is a 25HP electrical compressor or a 185CFM diesel compressor. It is important that the flow requirement is met, so that other work requiring compressed air is not compromised.
- Dryness: Dryer air will lead to a more trouble free operation. Dryness is often specified by dew point temperature (lower is better). If there is drying equipment in line, the air should be of decent quality. Lower quality air can be used but will limit the length of time that dry ice blasting equipment can run trouble free. Continental Carbonic sells and rents after cooler dryers.
- Air and Electrical Interface: For air line hook up, the line size should be ¾ " to 1", terminating in a 1" NPT male nipple with a shut off valve near the hook up point. If using an IceTech machine, a 1" claw coupling is needed. Working range will be the radius from each airdrop using approximately the sum of the air and blast hose included with the blasting equipment. If the desired working range exceeds 200 feet from an airdrop, a 1-1/2" air hose should be considered to reduce pressure loss. A standard 3 prong 110-volt electrical outlet on a 15 amp minimum breaker within 50 feet of the equipment you would like to clean is also needed, unless you are using an all pneumatic machine.